Sandblast nozzle



July 27, 1943. R. o. HOWARD 2,325,517

SAND BLAST NOZ ZLE Filed Feb. 7, 1942 g which fall within Patented July 27, 1943 fumr PATENT o c-E v 2325,51 1 I S'AN DBLAST NOZZLE Room o Howard, R'edd-i'ng, Calif; Application February 7, 1942, Serial No. 429,9;8'

50mins: (oI=. 51-1-1 I This invention relates to sand; blast nozzles;

An object of this. invention isto provide a nozzle= formed of an outer shellandan inner lining having a characteristic to resist abrasion by the sand flowing therethrough.v l

Another object of this invention is to-provide in asandblastnozzlemeans for. discharging waterthereinto rearwardl of the tip. 7

further object of thisinvention isto provide 2;":1'1G'ZZ18' of this kind with an improved tip having means for directing aconicalhead of water forwardly of thetip, j j V p A further. objector-this invention is to provide ina nozzle of this kind an improved tips formed.

:A further objectoithis invention: is to provide a nozzle structure including; alined: body formed with a taperedf-orward end onwhich tipsof various types may be mounted. j

To: the foregoing objects. and others which may hereinafter appear, the invention consists of the novel construction, combination and arrangement of parts as will! be more specifically referred to and illustratedeintheaccompanying drawing, but i-tis to beunderstood that changes, variations and modifications may; be resorted to the scope ofthe invention-as claimed. to 7 Inthedrawing; Q Figure 1 is a longitudinalsection of a sand blast. nozzle constructed according to a-n embodie.

lnent. of this-invention, I l t i Figure 2 is adetail front endelevation of the nozzle, v 1 Figure 3 is a sectional View taken onthe line 3. 3 of Figure 1,

Figure i is a sectionalvi ew taken onithe= line 4-4 of Figure 1 i, V Referring to the drawing the n1 1nieral l fldesig ates generally an outermetallic j acket which is formed of a cylindricall body; part; lt hawing" threads 13 at its rear end for connection with a sand conducting tube wherein the sand is under air or'other fluid pressure. i

The jacket member l also includes a frustoconical jacket member I2 terminating at its for ward end in a reduced cylindrical jacket member l4 having interior threads 15.

The jacket member [2 has fixedly secured thereto as at E6 an obtusely disposed water conducting nipple H which is adapted to boomnected to a source of water supply, so thatwater the Sand may be discharged into the interior of the jacket in. The inclination of the nipple lT- is such as to force thesand. and water within the jacket H) forwardlyior discharge through the forward; rid

of the jacket ID. V g

A- rubber lining. l 8, is disposed within the jacket member H and is'constructed of what 'ifs jknown as sand blast rubber liose'which isof arconstruc tion.to=resist abrasionby the sandpassing there through. The forward jacket-member [L2 is also formed witha lining I9 constructed of rubber such as sand. blast rubber or the like, and the I lining isfcrmed integral with the lining. [81. The lining I3 at its forward orreduce'dv end terminates in a; cylindrical. forward lining member 29 disk posed within the nippleor tip coupling [8;

The lining members comprisingtheparts [8,19 and 20 may be removabl'y held'in the jacket members 1 i I2 and I4 by fmeansof set screws 2! and 22, so that when it is desira blel or necessary tolreplacethe liningmembers, the set screws 211 and 22 may be released, and theliningflremoved. and substituted by a new lining. The'liningmember i9 is formedlwith an inclinediopening 23 which registers withthe inner end of the open irig ld formedlinlthe jacket [2; The-. dpen'ings 23 and 2d are coaxial with the nipple. LT, so that the waterdischarg'ed into the jacket H). from the nip 7 pie IT will be the direction of the flow rime sand. 7 l. g

A'Vtip structure is threaded into the forwar end" of the nipple [4' of the: nozzle structural!) shown inFigure'ln The up structure 39: includes an outericylind rical member- 40 which has awa terjacketll on the forward end portion thereof; 'I'h'ejacket 4T similar in every detail to. the jacket 25, being provided with alplurality of. forwardl'y andmwardly mcnnee j'et openings 42 for discharging a conical column ofwa-ter forwardly Of the" tip'. 7 l

"An inner tip'memberTM is disposed withihthe cylindrical? outer tip. member 40 andzincludes. a cylindrical tip member or nipple M which at its resi ns-'15. formed with an annular flange 45} Tli fia'nge. 4.5. is adaptedto seat at itsrear endeon the forward end of the'nipple or coupling men-rher [4 of the jacketlfll The rear portion ofthe,

cylindrical tip member 42 is provided with an annular recess 4'6 within which the outer portion of the rib or flange 45 is adapted to engage. Preferably, the width of the flange 45 is slightly greater than the depth of the groove or recess 46, so that a portion of the flange 45 will project rearwardly of the outerjacket member 43. In this manner when the tip 39 is tightened within the nipple I4, the flange 45 will tightly bear against the forward end of thenipple Hi, and will 'be tightly pressed into the recess or groove 46.

The cylindrical tip member 55 is held concentrically of the outer jacket member 4% by means of a plurality of circumferentially spaced apart set screws 41. An inner rubber lining 43 is disposed within the interior of the nipple member 44, so as to prevent the sand from coming in direct contact with the metal forming the reduced nip ple member Hi The jacket M has connected thereto a coupling nipple 59 which is adapted to be connected to a source of fluid supply, so as to V permit the discharge of water into the chamber 50 formed within the jacket ii. If desired, the

lining 48 may be formed of steel having a resist: ant characteristic to prevent undue abrasion from the sand passing therethrough.

In the use and operation of this nozzle the threads 13 of the jacket or nozzle member iii are adapted to'be connected to a source of sand supply under air or-other' fluid pressure, and the nipple I1 is adapted to be connected to a source ofwater supply. The nipple $9 is also adapted 'The sand, being under air pressure, will move forwardly through the tip 39 and at the same time 7 that the combined sand and water is being ejected from the tip 39 a substantially conical column of water or head will be discharged onto the work from the jet openings 62, so that the sand will wash off of the work after the sand has com pleted its abrasive action on the work. 7

What is claimed is:

1. In a sand blast nozzle including an outer body havinga substantially frusto-ccnical forward end portion terminating in a cylindrical coupling member, a tip detachably connected with said coupling member and comprising a cylindrical outer tipfmember, a water jacket about the forwardportion of said outer member, said jacket having a plurality 'of circumferentially spaced apart jet openings in the forward wall thereof inclined forwardly and inwardly to therebyproyide a substantially conical head of water forwardly of said tip, an inner tip member includinga cylindrical inner tip' body, an annular flange carried by the inner end of said inner tip body, said outer tip'inember having an internalrearwardly opening groove in the rear end thereof within which said flange 'is adapted to engage, means holding said inner tip body con-v centric'of said outer tip member, and a rubber lining within said inner tip body,

' -:2. In' asand blast nozzle including an outer body having a substantially frusto-conical forward end portion terminating ina cylindrical coupling member, a tip detachably connected with said coupling member and comprising a cylindricalouter tip member, a water jacket about the forward portion of said outer member, said jacket having a plurality of circumferentially spaced apart jet openings in the forward wall thereof inclined forwardly and inwardly to thereby provide a substantially conical head of water forwardly of said tip, an inner tip member including a cylindrical inner tip body, an annular flange carried by the inner end of said inner tip body, said outer tip member having an internal rearwardly opening groove in the rear end thereof within which said flange is adapted to engage, means holding said inner tip body concentric of said outer tip member, and a rubber lining with- .in said inner tip body, said flange having a depth greater than the width of said groove whereby a portion of said flange will project rearwardly of said outer tip member, thereby tightly maintaining'said inner'tip body within said outer tip member when the tip is coupled to said coupling member. I

3. A tip for connection with the forward end of a sand blast nozzle comprising a cylindrical body formed with threads at the rear portion thereof for connection with the nozzle, a water jacket disposed about said cylindrical body adjacent the forward end thereof, said jacket including an outer cylindrical wall, a rear wall and a forward'wall, said forward wall having a plurality of' circumferentially spaced'apart openings inclined forwardly and inwardly to thereby eject a plurality of inwardly extending water'streams forwardly of the tip, a nipple carried by said jacket for connection with a source of water supply, an inner tip member within said body, means securing said inner tip member concentrically of said body, and a rubber lining in said inner tip member. 7 a a 1 4. A sand blast nozzle tip comprising an outer cylindrical body provided with means at'its inner end for attachment to the nozzle and provided with an annular recess in the inner end thereof, an inner cylindrical tip member, a flange at the inner end of said inner tip member engaging" in said'annular recess, means outwardly of said flange holding said inner tip member concentrically of said outer body, and a rubber lining in said innertip member.

5. A sand blast nozzle tip comprising an outer cylindrical'b'ody provided with means at its inner end :for attachment to the'nozzle' and formed with an annular recess in the inner end thereof, a water chamber carried by the outer end portion of said body, said chamber including circumferentially arranged jet openings inclined forwardly toward the axial center of said body wherebya substantially conical column of water may be projected forwardly of said body, means connecting said chamber with a source of liquid pressure supply,aninnerlcylindrical tip member, aflang'e at the inner end of said inner tip member engaging in said annular recess, means outwardly of said flange holding said inner tip member concentrically cf said outer body, and a rubber lining in said inner tip member.

ROBERT o. HOWARD. 

